4. Seat in comfortable, fixed position (fully tightened)?
seat at ideal height (are you on tip toes when seated)?

5. same checks as front wheel and you could also check the gears and chain here for any abnormalities..

If the answer to any of these questions is no, then tighten it, heighten it, lower it, pump it.. if you’re not sure, or don’t have the tools, take it to your local friendly bike shop or make friends with a bicycologist. If the answer is yes, then pedal away, but don’t forget to keep on M-checking...

"Bicycology uses creative methods to encourage environmental responsibility.
Its aim is to promoting cycling as a healthy, practical and enjoyablealternative to high-carbon lifestyles, and to challenge the politics and economics that have led us down the road to environmental destruction and massive global injustice"